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Add --dhcp-option-pxe config.

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This acts almost exactly like --dhcp-option except that the defined option
is only sent when replying to PXE clients. More importantly, these
options are sent in reply PXE clients when dnsmasq in acting in PXE
proxy mode. In PXE proxy mode, the set of options sent is defined by
the PXE standard and the normal set of options is not sent. This config
allows arbitrary options in PXE-proxy replies. A typical use-case is
to send option 175 to iPXE. Thanks to Jason Berry for finding the
requirement for this.
This commit is contained in:
Simon Kelley
2024-12-05 17:07:40 +00:00
parent 5a1f2c577d
commit 7199531ff1
8 changed files with 126 additions and 49 deletions
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man/dnsmasq.8
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@@ -1395,7 +1395,7 @@ Options may be encapsulated (IPv4 only) within other options: for instance
will send option 175, within which is the option 190. If multiple
options are given which are encapsulated with the same option number
then they will be correctly combined into one encapsulated option.
encap: and vendor: are may not both be set in the same \fB--dhcp-option\fP.
encap: and vendor: may not both be set in the same \fB--dhcp-option\fP.
The final variant on encapsulated options is "Vendor-Identifying
Vendor Options" as specified by RFC3925. These are denoted like this:
@@ -1414,6 +1414,10 @@ except that the option will always be sent, even if the client does
not ask for it in the parameter request list. This is sometimes
needed, for example when sending options to PXELinux.
.TP
.B --dhcp-option-pxe=[tag:<tag>,[tag:<tag>,]][encap:<opt>,][vi-encap:<enterprise>,]<opt>,[<value>[,<value>]]
A variant of --dhcp-option which defines options only sent in reply to PXE clients. In addition, such options are
sent in reply to PXE clients when dnsmasq is acting as a PXE proxy, unlike other options. A typical use-case is option 175, sent to iPXE.
.TP
.B --dhcp-no-override
(IPv4 only) Disable re-use of the DHCP servername and filename fields as extra
option space. If it can, dnsmasq moves the boot server and filename